Julien Beillard argues that it makes no sense to say that morality is relatively true.
From Philosophy Now magazine.
The argument for moral relativism from moral diversity is not especially convincing as it stands. If the mere fact that people or groups disagree over some idea were enough to show that that idea has no objective truth value, there would be no objective truth about the age of the universe or the causes of autism.
Sure, going back to a definitive explanation for everything, conflciting goods may well be on par with physics and human biology.
No one is able to demonstrate that this is not the case.
Just as no one is able to demonstrate that conflicting goods are not merely the biological imperatives of a brain able to generate the illusion of free will.
But to equate the objective biological imperatives embedded in autism with an alleged objective argument that determines if autistic fetuses ought or ought not to be aborted is, in my view, the difference between a "truth value" in the either/or world and one in the is/ought world.
Hoping to ward off that counter-argument, relativists usually claim that these other disagreements are unlike moral disagreements in some relevant way. For instance, writing in this magazine, Jesse Prinz claimed that scientific disagreements can be settled by better observations or measurements, and that when presented with the same body of evidence or reasons, scientists come to agree, but the same cannot be said of thinkers operating with different moral codes.
Exactly. Or has there been an argument constructed that does in fact pin down whether, given a diagnosis of autism in the unborn, rational parents are obligated either to abort it or give birth to it.
Even if we grant this distinction, however, it is still doubtful that moral disagreement is a good reason for accepting moral relativism. After all, there is deep and apparently irresolvable disagreements in philosophy as well as morality. For instance, some philosophers think mental states such as pain or desire are just physical states; others deny this, and yet both camps are familiar with the evidence and reasons taken to support the opposing point of view. Should we say, then, that there is no objective truth about how mental states are related to the physical world? That seems deeply implausible. For that matter, many philosophers deny the moral relativist’s claim that moral truth is relative to what a given society believes. Does it follow that there is only relative truth and no objective truth about moral relativism itself – that moral relativism is true relative to the outlook of Jesse Prinz, say, and anti-relativism no less true relative to mine?
All this suggests is that while answers to questions like these are ever and always being debated, we should [in the interim] just take leap of faith to one side or the other. As though the leap itself need be as far as we go. We can't definitively substantiate, prove and establish the answer, but, here and now, my answer is the one I am sticking with.
In other words, Beillard starts with one set of assumptions and claims them as a "truth value", while Prinz starts with a conflicting set and claims them instead.
So, you tell me: what has actually been demonstrated here to be the truth value?
On the one hand, in relation to autism as a medical condition given a set of biological imperatives, and, on the other hand, in relation to aborting autistic fetuses given a set of moral imperatives.